// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/process/process_handle.h"

#include "base/files/file_util.h"
#include "base/process/internal_linux.h"

namespace base {

ProcessId GetParentProcessId(ProcessHandle process)
{
    ProcessId pid = internal::ReadProcStatsAndGetFieldAsInt64(process, internal::VM_PPID);
    if (pid)
        return pid;
    return -1;
}

FilePath GetProcessExecutablePath(ProcessHandle process)
{
    FilePath stat_file = internal::GetProcPidDir(process).Append("exe");
    FilePath exe_name;
    if (!ReadSymbolicLink(stat_file, &exe_name)) {
        // No such process.  Happens frequently in e.g. TerminateAllChromeProcesses
        return FilePath();
    }
    return exe_name;
}

} // namespace base
